<template>
  <view>
    <!-- 滑动区域 -->
    <my-search @myclick="goto"></my-search>
    <view class="scroll-view-container">
      <!-- 左边的一级导航 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',active===i?'active':'']" @click="actChange(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右边的二级导航 -->
      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
        <!-- 标题分类 -->
        <view v-for="(item2,i2) in cateLevel2" :key="i2" class="cate-lv2">
          <!-- 标题名字 -->
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <!-- 三级导航 -->
          <view class="cate-lv3-list">
            <view v-for="(item3,index3) in item2.children" :key="index3" class="cate-lv3-item" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>

        </view>
        
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '../../mixin/tabar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        cateList:[],
        cateLevel2:[],
        active:0,
        wh:0,
        scrollTop:0
      }
    },
    onLoad(){
      
      this.getlv2List('/api/public/v1/categories ','cateList')
      const sysInfo=uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight-50
    },
    methods: {
      goto(){
        uni.navigateTo({
          url:'../../subpkg/search/search'
        })
      },
      actChange(index){
        this.active=index
        this.cateLevel2=this.cateList[index].children
        this.scrollTop=this.scrollTop?0:1
      },
      async getlv2List(addr,list){
     const {data:res}=await uni.$http.get(addr)
     if(res.meta.status!=200) return uni.$showMsg();
     this.cateLevel2=res.message[0].children
     this[list]=res.message
    },
    gotoGoodsList(item3){
      uni.navigateTo({
        url:'../../subpkg/goods_list/goods_list?cid='+item3.cat_id
      })
    }
    }
  }
</script>

<style lang="scss">
  // 容器
  .scroll-view-container{
    display: flex;
    // 左侧滑动导航区域
    .left-scroll-view{
      width: 120px;
      // 单个样式
      .left-scroll-view-item{
        line-height: 120rpx;
        text-align:center;
        font-size: 12px;
        background-color: #f7f7f7;
        // 选中时样式
        &.active{
          background-color: #ffffff;
          position: relative;
          &::before{
            content: ' ';
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
    .right-scroll-view{
      .cate-lv2{
        .cate-lv2-title{
          font-size: 12px;
          font-weight: bold;
          text-align: center;
          padding: 15px 0;
        }
        .cate-lv3-list{
          display: flex;
          flex-wrap: wrap;
          .cate-lv3-item{
            width: 33.33%;
            display: flex;
            flex-direction: column;
            margin-bottom: 10px;
            align-items: center;
            image{
              width: 60px;
              height: 60px;
            }
            text{
              font-size: 12px;
            }
          }
        }
      }
    }
  }
</style>
